FC/iSCSI SAN
A SAN (Storage Area Network) is a network specifically dedicated to the task of transporting data for storage and retrieval. SAN architectures are alternatives to storing data on disks directly attached to servers or storing data on Network Attached Storage (NAS) devices which are connected through general purpose networks.
Usually SAN acts as a common storage in Cluster environment. A centralized storage is also a common usage.
SAN diagram
Storage Area Networks are traditionally connected over Fibre Channel networks. Storage Area Networks have also been built using SCSI (Small Computer System Interface) technology. An Ethernet network which was dedicated solely to storage purposes would also quality as a SAN.
Depsite of common storage in cluster, SAN can also be used to centralize all distributed data among servers. A centralized storage architecture much easier to manage, backup and protect data.
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